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Effect of Mg fertilization on yellowing disease of Norway spruce at higher elevations of the Šumava Mts., Czech Republic
Mg deficiency defoliation long-term effect
2015/3/3
Norway spruce yellowing and defoliation caused by Mg deficiency was frequently recorded on many sites
of the Šumava Mts. (Bohemian Forest Mts.) since 1980’s. A forest experiment aimed at invest...
酸性森林土壤中Ali/(Ca+Mg)摩尔比值的分布特征及影响因素
Ali/(Ca+Mg)摩尔比值 酸性森林土壤 酸沉降
2007/12/18
研究了西南和华南酸性森林土壤中Ali/(Ca+Mg)摩尔比值的分布特征与影响因素,用主成分分析(PCA)和偏最小二乘法(PLS)回归综合评价各种影响因素及其相对重要性. 2000～2002年连续3年的监测结果表明,大多数土壤水中该摩尔比值都小于临界值1.0,说明土壤铝释放还未对植被造成显著伤害.偏最小二乘法(PLS)回归显示,土壤铝饱和度(AlS)是影响A层土壤水中Ali/(Ca+Mg)摩尔比值的...